Odd problem using mini display cord and power cord at the same time

When i connect my mbp to a monitor/tv while running on ac the macbook freezes totally. As soon as i plug in the power cord while running an external monitor the cpu usage goes crazy. Kernal task reporting 100.1 % cpu usage and also high cpu usage (powered, syslogd and configd). The only way to unfreeze the macbook is to unplug the power cord. When i do this the laptop runs perfectly fine again while connected to my monitor.
The odd thing is that it was running totally fine a few hours ago. but after waking up my mac its showing this issue.
Would love to get feedback.
Thanks

I use a KVM switch with a Dell monitor that has DVI and VGA inputs. I only route the K an M portions (keyboard and mouse) through the switch. The computers connect directly via VGA and DVI to the Monitor, and then I use the monitor's switch to make the video switch. Works fine. Don't worry about taxing the monitor.
I'd suggest buying the KVM switch from a vendor with easy return policies, since it can take a few tries to find a model you like.

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